Probably
not more than 60 of these unique guns were ever produced .. somewhere around
1856. The turret had 6 hinged chambers which hung suspended under the gun.
When the lever was opened it rotated the turret and cammed a chamber into line
with the barrel. Closing the lever slid a gas seal around the front of the
chamber.

It
was said to be a very "speedy" operating action, and was a different
approach, trying to deal with the gas leakage at the cylinder/barrel breech.